Download Analog Signal Monitoring Option

Analog Signal
Monitoring Option
For VERBATIM
Automatic Dialing
Remote Monitoring System
Unlike the conventional two-state contact type inputs,
an analog signal is continuously variable. The level of
the signal represents some physical variable quantity
such as water level, pressure, etc. A VERBATIM autodialer equipped with analog inputs will report the
physical variable value spoken in terms of the actual
physical units, and will initiate alarm calls when these
values exceed user-programmed high or low alarm
setpoints.
Like contact channels, any analog channel may also
be completely turned off so that it never reports or
causes alarms.
Analog inputs are available for 1, 4, 8 or 16 channels.
The unit automatically assigns installed analog channels the first available channel numbers beyond the
number of conventional contact channels.
Terminal strip connection points are unpluggable type
for convenience of installation.
The standard signal input type is 4-20 milliamperes.
70 ohm load gives maximum loop voltage drop of 1.4
volts @ 20 milliamperes.
Other signal input types available on order:
Raco Temperature Sensor ( – 20 to + 120 deg F)
Certain other non-thermocouple temperature
sensors
DC voltages 0-1, 0.2-1, 1-5, 0-10, etc.
Each signal input is differential (i.e. double ended or
floating with respect to ground), with an allowable
common mode range of ± 10 volts (i.e. both sides of
each input must be within 10 volts of AC electrical.
ground).
Measurement accuracy is within ± 0.3% of full scale
absolute accuracy over an environmental temperature
range of 32 to 110 degrees F, and typically ± 0.15% at
room temperature. The system uses a high-resolution
12-bit converter, providing a measurement resolution
of one part in 4,096. Measurements are reported
rounded to 4 significant digits (with respect to full
scale). Setpoints and scaling factors of up to 4 significant digits may be entered, with an optional decimal
point at any position. Setpoint entries may not exceed
the full scale span of the signal. High and low setpoints may be independently enabled and disabled.
Each input has heavy duty surge protection (gas tubes
backed up with solid state tranzorbs) meeting IEEE
Standard 587, Category B. Unlike most “isolation”
schemes, this protection is effective with the fast
risetimes characteristic of lightning-induced surges.
Gain and offset scaling factors are field programmable.
These are the factors which the unit uses to translate
the analog signal level into corresponding spoken
physical units of measure. This programmability includes the unique ability to fine-tune the scaling factors based on the user’s on-the-spot observation of the
physical quantity being measured, without need to
measure the signal level with test instruments.
The user may optionally record a preamble message
identifying the quantity being measured, separately for
each analog channel. Additional speech memory is
provided (14/21/28/40 seconds depending on speech
rate, for each block of 4 or fewer analog channels) up
to the overall system maximum of 56/84/112/162
seconds.
All programming may be done by either front panel or
over-the-phone command at the user’s choice and
does not require physical manipulation of switches,
etc. The type of signal accommodated (e.g. 4-20
milliamperes), and the number of analog channels, is
physically configured on the plug-in analog card as
ordered from the factory. Each card can accommodate up to 8 analog channels; 2 cards are required
for 16 channels.
The analog option is field upgradable and expandable,
requiring installation of plug-in IC chips, circuit cards
and card guides, but no soldering.
Analog Signal
Monitoring Specifications:
Available Input Hardware Configurations:
o 4 to 20 ma DC
o 0 to 1 volt DC
o RACO TS705A Temperature Sensor, – 67 to
+120 F or – 30 to +55C
o Consult Raco for other input configurations
Accuracy:
o ±0.3% of full scale from – 32 to 110 F
A/D Resolution
o 12 BITS (1 part in 4,096)
o Readings spoken to 4 significant digits at full scale
Input Impedance:
o Over 50,000 ohms for voltage inputs
o 70 ohms for 4-20 ma input
Differential Input Common Mode Range:
o ±10 volts with respect to ground for DC inputs
Speech Messages:
o User recordable
o Generic default messages also provided
Surge Protection:
o Gas Tube followed by solid state Tranzorb
o Meets IEEE Standard 587, category B
Effect on 24 Hour Battery Backup:
o Reduces 24 hour rating to 16 hours
o No effect on standard 6 hour rating
Specify Number and Configuration of Inputs
at Time of Order:
o Input Configuration (e.g. 4-20 ma)
o 1 1 A-1E for 1 analog input, or
o 4 4A-1E for 4 analog inputs, or
o 8 8A-1E for 8 analog inputs, or
o 16 16A-2E for 16 analog inputs
Scaling of Spoken Readings:
o User programmable
o Easily fine tuned to match observed values or other
instrumentation
Specifications subject to change without notice
Touch Tone is a registered trademark of AT&T
MANUFACTURING AND ENGINEERING CO.
1400–62nd Street • Emeryville, CA 94608
(510) 658-6713 • FAX: (510) 658-3153
1-800-722-6999
E-mail: [email protected]
Web site: www.racoman.com
#119 Printed in U.S.A.